The U.S. government said Wednesday that it has blacklisted some Chinese firms and imposed visa restrictions on company executives involved in asserting Beijing's claims in the South China Sea, a move likely to fuel further bilateral tension over the disputed waters.The actions were taken after the United States in July toughened its policy on the South China Sea, which is contested by China and several Southeast Asian nations, calling Beijing's claims to offshore resources across most of the waters "completely unlawful.""The United States will act until we see Beijing discontinue its coerci…READ FULL ARTICLE